1790   3.93
1800   5.31
1810   7.24
1820   9.64
1830  12.87
1840  17.07
1850  23.19
1860  31.44
1870  39.82
1880  50.16
1890  62.95
1900  75.99
1910  91.97
1920 105.71
1930 122.78
1940 131.67
1950 150.70
1960 179.32
1970 203.30
1980 226.55
1990 248.71
